linux-kernel - Re: [PATCH v3] blk-ioc: don't hold queue_lock for ioc_lookup

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Message-Id: <175379203368.176672.14343982267949571023.b4-ty@kernel.dk>
Date: Tue, 29 Jul 2025 06:27:13 -0600
From: Jens Axboe <axboe@...nel.dk>
To: jack@...e.cz, dlemoal@...nel.org, Yu Kuai <yukuai1@...weicloud.com>
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
 yukuai3@...wei.com, yi.zhang@...wei.com, yangerkun@...wei.com, 
 johnny.chenyi@...wei.com
Subject: Re: [PATCH v3] blk-ioc: don't hold queue_lock for ioc_lookup_icq()


On Tue, 29 Jul 2025 10:32:29 +0800, Yu Kuai wrote:
> Currently issue io can grab queue_lock three times from bfq_bio_merge(),
> bfq_limit_depth() and bfq_prepare_request(), the queue_lock is not
> necessary if icq is already created because both queue and ioc can't be
> freed before io issuing is done, hence remove the unnecessary queue_lock
> and use rcu to protect radix tree lookup.
> 
> Noted this is also a prep patch to support request batch dispatching[1].
> 
> [...]

Applied, thanks!

[1/1] blk-ioc: don't hold queue_lock for ioc_lookup_icq()
      (no commit info)

Best regards,
-- 
Jens Axboe